下山变电站6 kV侧系统铁磁谐振消谐及仿真分析

摘要

铁磁谐振可导致电力系统绝缘损害和电压故障,严重影响配电网的安全运行,寻求防范铁磁谐振过电压事故的措施,对于保障动力系统正常运行具有重要意义.笔者通过对变电站铁磁谐振仿真模型的研究,确定了系统出现的谐振类型,对各种消谐方法进行分析比较,提出了在PT开口三角绕组处连接小电阻的消谐措施,并通过仿真软件验证了消谐措施的有效性.%The ferroresonance can cause insulation damage and voltage fault of the power system,which seriously affected safe operation of the distribution network.It is important to seek the measures of suppressingferroresonance overvoltage accident so as to ensure normal operation of the power system.After studying the simulation model of substation ferroresonance,the resonant types of system were determined,and several ferroresonance suppression measures were analyzed and compared.In addition,the ferroresonance suppression measure of adding resistance at broken delta winding of potential transformer (PT) was offered,and its effectiveness was verified through simulation.